11 losses in a row is not out of the norm, even if you're playing heads up. I've had literally 4 or 5 games at once where I had premium pocket pairs at the same exact time, got all my chips in on every table, and lost every single one of them. A bad run does not necessarily mean you're playing bad, but then again, your good run does not mean your were playing that well either.
My only suggestions are to continue to try and improve your game, and exercise strict bankroll management. Don't be afraid to drop down to lower buy in games if your bankroll gets too low.
And no, there are not any "huge question marks to online poker." People that claim there are have literally no proof at all except their isolated examples that they say "happen all the time." Search all you want, but I guarantee you that you will never find a person who has proven that online poker strays from the statistical norm in the long run. And there are plenty of people who have played millions of hands and have statistics on all of them, so it's not like nobody has ever had the chance.
I'm a Supernova on Pokerstars.